Why Maksim Dropped Kirstie Last Night [VIDEO]

The drop that was heard all over the United States.  Last night Maksim Dropped Kirstie on DWTS. I gasped at first and chuckled when they were ok and applauded a excellent dance routine. Like true professionals they just kept dancing. Maksim did however need a quick second to shake out his leg cramp.  So What happened last night? watch the video.